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![Junio C Hamano](/assets/img/avatar_default.png)
A few commands that parse --expire=<time> command line option behave
sillily when given nonsense input. For example
$ git prune --no-expire
Segmentation falut
$ git prune --expire=npw; echo $?
129
Both come from parse_opt_expiry_date_cb().
The former is because the function is not prepared to see arg==NULL
(for "--no-expire", it is a norm; "--expire" at the end of the
command line could be made to pass NULL, if it is told that the
argument is optional, but we don't so we do not have to worry about
that case).
The latter is because it does not check the value returned from the
underlying parse_expiry_date().
This seems to be a recent regression introduced while we attempted
to avoid spewing the entire usage message when given a correct
option but with an invalid value at 3bb0923f
("parse-options: do not
show usage upon invalid option value", 2018-03-22). Before that, we
didn't fail silently but showed a full usage help (which arguably is
not all that better).
Also catch this error early when "git gc --prune=<expiration>" is
misspelled by doing a dummy parsing before the main body of "gc"
that is time consuming even begins. Otherwise, we'd spend time to
pack objects and then later have "git prune" first notice the error.
Aborting "gc" in the middle that way is not harmful but is ugly and
can be avoided.
Helped-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
243 lines
5.3 KiB
C
243 lines
5.3 KiB
C
#include "git-compat-util.h"
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#include "parse-options.h"
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#include "cache.h"
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#include "commit.h"
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#include "color.h"
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#include "string-list.h"
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#include "argv-array.h"
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#include "sha1-array.h"
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/*----- some often used options -----*/
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int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
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{
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int v;
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if (!arg) {
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v = unset ? 0 : DEFAULT_ABBREV;
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} else {
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v = strtol(arg, (char **)&arg, 10);
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if (*arg)
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return opterror(opt, "expects a numerical value", 0);
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if (v && v < MINIMUM_ABBREV)
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v = MINIMUM_ABBREV;
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else if (v > 40)
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v = 40;
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}
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*(int *)(opt->value) = v;
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return 0;
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}
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int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
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int unset)
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{
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*(timestamp_t *)(opt->value) = approxidate(arg);
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return 0;
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}
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int parse_opt_expiry_date_cb(const struct option *opt, const char *arg,
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int unset)
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{
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if (unset)
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arg = "never";
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if (parse_expiry_date(arg, (timestamp_t *)opt->value))
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die(_("malformed expiration date '%s'"), arg);
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return 0;
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}
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int parse_opt_color_flag_cb(const struct option *opt, const char *arg,
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int unset)
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{
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int value;
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if (!arg)
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arg = unset ? "never" : (const char *)opt->defval;
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value = git_config_colorbool(NULL, arg);
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if (value < 0)
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return opterror(opt,
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"expects \"always\", \"auto\", or \"never\"", 0);
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*(int *)opt->value = value;
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return 0;
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}
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int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
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int unset)
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{
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int *target = opt->value;
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if (unset)
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/* --no-quiet, --no-verbose */
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*target = 0;
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else if (opt->short_name == 'v') {
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if (*target >= 0)
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(*target)++;
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else
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*target = 1;
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} else {
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if (*target <= 0)
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(*target)--;
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else
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*target = -1;
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}
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return 0;
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}
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int parse_opt_commits(const struct option *opt, const char *arg, int unset)
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{
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struct object_id oid;
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struct commit *commit;
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if (!arg)
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return -1;
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if (get_oid(arg, &oid))
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return error("malformed object name %s", arg);
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commit = lookup_commit_reference(&oid);
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if (!commit)
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return error("no such commit %s", arg);
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commit_list_insert(commit, opt->value);
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return 0;
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}
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int parse_opt_object_name(const struct option *opt, const char *arg, int unset)
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{
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struct object_id oid;
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if (unset) {
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oid_array_clear(opt->value);
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return 0;
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}
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if (!arg)
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return -1;
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if (get_oid(arg, &oid))
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return error(_("malformed object name '%s'"), arg);
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oid_array_append(opt->value, &oid);
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return 0;
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}
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int parse_opt_tertiary(const struct option *opt, const char *arg, int unset)
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{
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int *target = opt->value;
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*target = unset ? 2 : 1;
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return 0;
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}
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struct option *parse_options_concat(struct option *a, struct option *b)
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{
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struct option *ret;
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size_t i, a_len = 0, b_len = 0;
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for (i = 0; a[i].type != OPTION_END; i++)
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a_len++;
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for (i = 0; b[i].type != OPTION_END; i++)
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b_len++;
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ALLOC_ARRAY(ret, st_add3(a_len, b_len, 1));
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for (i = 0; i < a_len; i++)
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ret[i] = a[i];
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for (i = 0; i < b_len; i++)
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ret[a_len + i] = b[i];
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ret[a_len + b_len] = b[b_len]; /* final OPTION_END */
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return ret;
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}
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int parse_opt_string_list(const struct option *opt, const char *arg, int unset)
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{
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struct string_list *v = opt->value;
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if (unset) {
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string_list_clear(v, 0);
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return 0;
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}
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if (!arg)
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return -1;
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string_list_append(v, arg);
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return 0;
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}
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int parse_opt_noop_cb(const struct option *opt, const char *arg, int unset)
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{
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return 0;
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}
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/**
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* Report that the option is unknown, so that other code can handle
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* it. This can be used as a callback together with
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* OPTION_LOWLEVEL_CALLBACK to allow an option to be documented in the
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* "-h" output even if it's not being handled directly by
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* parse_options().
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*/
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int parse_opt_unknown_cb(const struct option *opt, const char *arg, int unset)
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{
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return -2;
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}
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/**
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* Recreates the command-line option in the strbuf.
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*/
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static int recreate_opt(struct strbuf *sb, const struct option *opt,
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const char *arg, int unset)
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{
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strbuf_reset(sb);
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if (opt->long_name) {
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strbuf_addstr(sb, unset ? "--no-" : "--");
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strbuf_addstr(sb, opt->long_name);
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if (arg) {
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strbuf_addch(sb, '=');
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strbuf_addstr(sb, arg);
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}
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} else if (opt->short_name && !unset) {
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strbuf_addch(sb, '-');
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strbuf_addch(sb, opt->short_name);
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if (arg)
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strbuf_addstr(sb, arg);
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} else
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return -1;
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return 0;
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}
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/**
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* For an option opt, recreates the command-line option in opt->value which
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* must be an char* initialized to NULL. This is useful when we need to pass
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* the command-line option to another command. Since any previous value will be
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* overwritten, this callback should only be used for options where the last
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* one wins.
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*/
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int parse_opt_passthru(const struct option *opt, const char *arg, int unset)
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{
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static struct strbuf sb = STRBUF_INIT;
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char **opt_value = opt->value;
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if (recreate_opt(&sb, opt, arg, unset) < 0)
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return -1;
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free(*opt_value);
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*opt_value = strbuf_detach(&sb, NULL);
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return 0;
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}
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/**
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* For an option opt, recreate the command-line option, appending it to
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* opt->value which must be a argv_array. This is useful when we need to pass
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* the command-line option, which can be specified multiple times, to another
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* command.
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*/
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int parse_opt_passthru_argv(const struct option *opt, const char *arg, int unset)
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{
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static struct strbuf sb = STRBUF_INIT;
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struct argv_array *opt_value = opt->value;
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if (recreate_opt(&sb, opt, arg, unset) < 0)
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return -1;
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argv_array_push(opt_value, sb.buf);
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return 0;
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}
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